Who takes advantage of single mom

2 years ago I started seeing Doug Coyne. He moved in with me. A year later we were married. I'm a single mom of 3. One of my kids is autistic. 2 months after Doug moved in with me he was hurt at work. He went a year without working. While I worked 2 jobs to support us. 2 days after his doctor approved him to return to work. He said he was leaving because he couldn't handle my autistic son anymore. What kind of person takes advantage of a single mom?
My family wants me to try to get spousal support. His attorney wants me to sign the divorce papers with him not paying anything. I can't afford an attorney. What should I do?

He is not a father of your children, that's a problem. But you should try at least to get reimbursement of all expenses that you had while he was incapacitated.
And sorry about your situation. Hope for the best solution for you.